Can someone me on #12? i’m confused on what’s it asking

Explanation:

The given valence electronic configurations is as follows.

In this configuration, completely filled s-orbital and electrons are enters into the p-bolck therefore, it is p-block configuration.

In this configuration, electrons are enters into the s-bolck therefore, it is s-block configuration.

In this configuration, completely filled s-orbital and electrons are enters into the d-bolck therefore, it is d-block configuration.

In this configuration, completely filled s-orbital and electrons are enters into the p-bolck therefore, it is p-block configuration.

atomic number of carbon is 6

electronic configuration of carbon is 1s²2s²2p²

orbital diagram of carbon is as shown here in the image.

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

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~ trueboss72